legit BB opa2134 ?

[geezbill]

are these fake? i have bought a few of these and put them in my GCX as well as one for another build. Now i'm starting to doubt they are real. Supposedly there are some legit BB ones without a pin 1 indicator.

https://www.ebay.com/itm/134701815055

 

[jwin615]

No idea just looking at an bay photo. They don't look obviously fake, but they do look more expensive than mouser.

 

[geezbill]

No idea just looking at an bay photo. They don't look obviously fake, but they do look more expensive than mouser.

ya not taking chances. gonna buy from mouser although mouser are TI brand not Burr Brown

 

[jwin615]

TI bought BB 25 years ago

 

[xconverge]

Looks nearly identical (bad logo, similar date code) to one I had a problem with from tayda, I vote fake

X

Post in thread 'checking for fake OPA2134?'

Sep 16, 2024

New OPA2134 from mouser came today

Popped it in and the sound I was hearing is gone, General Tso is perfect now.

I performed the same test with the unity gain setup and got 8.48mA so basically exactly matching the datasheet (vs the 0.96mA I got for whatever the Tayda chip is/was)

Top is fake, bottom is new one. The logo is probably the biggest smoking gun (besides the fact that I heard the problem with my ears first which is excellent in this sort of situation)

• xconverge

 

[owlexifry]

from this photo in the ad you linked - looks fake.

if you want genuine, ya gotta buy em from mouser.

https://mou.sr/4r0AHOf

this is a mouser-sourced OPA2134PA:


although if you just want to get on with life and not waste aud$11.94 on x1 dual opamp, a TL072 should suffice.

 

[HamishR]

That Mouser-sourced pic looks like the OPA2134s I have. I have a few of them and seem to replace them with something else whenever I have used them.They're probably a bit too hi-fi or something for me. I use TL072s (just bought a bunch off Mouser for not too much $$) or TLC272s which seem to work for me. The differences are extremely minor! In most pedals you'd never know which I had used. In fact the first pedal where I could hear much difference was in an OD which relied purely on opamp breakup for the distortion. Then I could (just about) hear the difference, and in that circuit the OPA2134 was my least favourite option.

 

[dot matrix madness]

The OPA2134 has way lower total harmonic distortion than the TL072 or NE5532, but this is IMHO only
justified in circuits such as phono preamps. Thus checking for fake ones would most likely require a
spectrum analyzer. But just record a pure 1kHz sine wave and then check with a simple audio program,
such as Audacity.